S. 245AA : Interim Boards for Settlement-Scope of total income-Accrual of income-Interest on Government securities-Mercantile system-Right to receive interest on Government securities vests only on due date stipulated therein and not on a day‑to‑day basis-Order of Settlement Commission set aside for being contrary to law and for violation of principles of natural justice-Matter remanded to the Interim Boards for Settlement. [S. 5145,245AA 245C, 245D, Art. 226]